Maxim Integrated MAX491CSD-T Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers

The MAX491CSD-T is a high-performance, low-power transceiver for RS-485 and RS-422 communication from Maxim Integrated. This device features a slew-rate-limited driver that minimizes electromagnetic interference (EMI) and reduces reflections caused by improperly terminated cables, making it ideal for industrial, network, and telecommunications applications where long cable lengths and data integrity are paramount.

Designed for half-duplex communication, the MAX491CSD-T allows for data rates up to 2.5Mbps, making it suitable for both high-speed and extended-distance applications. The device operates from a single 5V supply and features a 1/4-unit-load receiver input impedance, which allows up to 128 transceivers on the bus. This high fan-out capability makes it an excellent choice for complex networks that require a large number of nodes.

The MAX491CSD-T ensures reliable communication with its fail-safe feature that guarantees a logic-high receiver output when the receiver inputs are open or shorted. This prevents false data transmission that can occur in the absence of a signal. The transceiver also incorporates thermal shutdown and current limiting to provide protection against excessive power dissipation and bus contention that may cause damage to the device.

The device is available in a compact 14-pin SOIC package, making it a space-saving solution for PCB layouts. The MAX491CSD-T is specified for operation from -40°C to +85°C, ensuring stable performance in a wide range of environmental conditions. With its integrated protection features and robust design, the MAX491CSD-T from Maxim Integrated is a reliable and efficient solution for RS-485/RS-422 communication in demanding applications.

Key features of the MAX491CSD-T include:

• Low-power operation
• Slew-rate-limited driver for reduced EMI
• Up to 2.5Mbps data rate
• 1/4-unit-load receiver input impedance allows up to 128 transceivers on the bus
• Fail-safe receiver for open, shorted, or idle bus
• Thermal shutdown and current limiting for device protection
• Operates from a single 5V supply
• Extended temperature range: -40°C to +85°C

Whether you're designing a network in an industrial setting, a security system, or a complex telecommunications system, the MAX491CSD-T transceiver offers a mix of performance and reliability that is hard to match.